#!/usr/bin/python
# Filename:using_dict.py

# 'ab' is short for 'a'ddress'b'ook
ab={'Swaroop':'swaroopch@byteofpython.info',
    'Larry':'larry@wall.org',
    'Matsumoto':'matz@ruby-lang.org',
    'Spammer':'spammer@hotmail.com'
}

print "Swaroop's address is %s" % ab['Swaroop']

#Adding a key/value pair
ab['Guido']='guido@python.org'

#deleting a key/value pair
del ab['Spammer']

print '\nThere are %d contacts in the address-book\n' % len(ab)

for name,address in ab.items():
    print 'Contact %s at %s' % (name,address)

if 'Guido' in ab:# OR ab.has_key('Guido')
    print "\nGuido's address is %s" % ab['Guido']
#modify the value of key mapped
if 'Guido' in ab:
    ab['Guido']='guido@modify.com'
    print "\n Guido's address is %s after modify" % ab['Guido']
